<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="$router.back()"
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail markdown-body">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- 模板中的$event是事件参数
          当我们传给自组建的数据既要使用，又要修改
          传递：props :isFollowed="article.is_followed"
          修改：自定义事件 @updata-is_followed="article.is_followed = $event"
          简写方式：在组件上使用v-model
          value= 'article.is_followed'
          @input='article.is_followed=$event'-->
          <follow-user
            class="follow-btn"
            v-model="article.is_followed"
            :user-id="article.aut_id"
          />
          <!-- /* v-model 相当于以下操作 */ -->
          <!-- <follow-user
            class="follow-btn"
            :value="article.is_followed"
            @input="article.is_followed = $event"
            :user-id="article.aut_id"
          ></follow-user> -->
          <!-- 单个 -->
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            :loading="followLoading"
            @click="onFollow"
            >已关注</van-button
          >
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            :loading="followLoading"
            @click="onFollow"
            >关注</van-button
          > -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content"
          v-html="article.content"
          ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
        <comment-list
          :list="commentList"
          :source="article.art_id"
          @onload-success="totalCommentCount = $event.total_count"
        ></comment-list>
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            @click="isPostShow = true"
            class="comment-btn"
            type="default"
            round
            size="small"
            >写评论
          </van-button>
          <van-icon
            class="comment-icon"
            name="comment-o"
            :info="totalCommentCount"
          />
          <!-- 收藏 -->
          <collect-article
            :article-id="article.art_id"
            class="btn-item"
            v-model="article.is_collected"
          ></collect-article>
          <!-- <van-button class="btn-item" icon="star-o" /> -->
          <!-- 点赞 -->
          <dianzan-article
            class="btn-item"
            v-model="article.attitude"
            :article-id="article.art_id"
          ></dianzan-article>
          <!-- <van-button class="btn-item" icon="good-job-o" /> -->
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->

        <!-- 发布评论的弹出层 -->
        <van-popup v-model="isPostShow" position="bottom"
          ><comment-post
            :target="article.art_id"
            @post-success="onPostSuccess"
          ></comment-post
        ></van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>
  
  <script>
import { getArticleById } from "@/api/article";
import { ImagePreview } from "vant";
import FollowUser from "@/components/follow-user";
import CollectArticle from "@/components/collect-article";
import DianzanArticle from "@/components/dianzan-article";
import CommentList from "./components/coment-list.vue";
import CommentPost from "./components/comment-post.vue";
export default {
  name: "ArticleIndex",
  components: {
    FollowUser,
    CollectArticle,
    DianzanArticle,
    CommentList,
    CommentPost,
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true,
    },
  },
  data() {
    return {
      article: {}, //文章详情
      loading: true, //加载中的loading状态
      errStatus: 0, //失败状态码
      followLoading: false,
      totalCommentCount: 0,
      isPostShow: false, //控制发布曾的弹出状态
      commentList: [], //评论列表
    };
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle();
  },
  mounted() {},
  methods: {
    async loadArticle() {
      // 展示 loading 加载中
      this.loading = true;
      try {
        const { data } = await getArticleById(this.articleId);
        // 随机错误
        // if (Math.random() > 0.5) {
        //   JSON.parse('dsankljdnskaljndlkjsa')
        // }
        // console.log(data)
        this.article = data.data;
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404;
        }
        console.log("抱歉请求出错", err);
      }
      // 无论成功还是失败都要关闭loading
      this.loading = false;
    },
    previewImage() {
      const articleContent = this.$refs["article-content"];
      const imgs = articleContent.querySelectorAll("img");
      console.log(imgs);
      imgs.forEach((img, ArticleIndex) => {
        images.push(img.src);
        img.onclick = () => {
          ImagePreview({
            images,
            startPosition: index, //起始位置
          });
        };
      });
    },
    onPostSuccess(data) {
      //关闭弹层
      this.isPostShow = false;
      //将发布内容显示到列表顶部
      this.commentList.unshift(data.new_obj);
    },
  },
};
</script>
  
  <style scoped lang="less">
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: #fff;
  }
  .article-detail {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 40px;
    }
    .comment-icon {
      top: 2px;
      color: #777;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
    .btn-item {
      border: none;
      padding: 0;
      height: 40px;
      line-height: 40px;
      color: #777777;
    }
    .collect-btn--collected {
      color: #ffa500;
    }
    .like-btn--liked {
      color: #e5645f;
    }
  }
}
</style>
  